MBB vs VTI: Holdings Overlap
iShares · 11144 holdings · $39.1B · as of 2026-05-31
VTIVanguard Total Stock Market Index Fund
Vanguard · 3505 holdings · $696.4B · as of 2026-03-31
Holdings snapshots are 61 days apart (MBB: 2026-05-31, VTI: 2026-03-31). Weights and index membership change between snapshots, so the true current overlap is typically higher than shown. For funds tracking the same index, the gap can be 5–15 points.
How similar are MBB and VTI?
iShares MBS ETF (MBB, by iShares) holds 11144 positions; Vanguard Total Stock Market Index Fund (VTI, by Vanguard) holds 3505. They have 0 holdings in common, and by portfolio weight the two funds are 0.0% identical. In practical terms the pair is essentially distinct, holding almost none of the same securities.
- Overlap by Weight
- 0.0%Sum of the smaller weight of each shared holding
- Shared Holdings
- 0MBB holds 11144 · VTI holds 3505
- Weight in Shared Holdings
- MBB 0%·VTI 0%Share of each fund's weight in stocks both funds own
Based on each fund's latest official holdings. How is this calculated?
What makes each fund different
Only in MBB
11144 of 11144 positions (98.1% of the fund) are not held by VTI. Showing the top 30 by weight.
- Freddie Mac Pool1.05%
- Ginnie Mae0.95%
- Uniform Mortgage-Backed Security, TBA0.83%
- Ginnie Mae0.67%
- Uniform Mortgage-Backed Security, TBA0.64%
- Ginnie Mae II Pool0.55%
Performance
| Fund | 1M | YTD | 1Y | 3Y (ann.) | 5Y (ann.) | 10Y (ann.) | Yield |
|---|---|---|---|---|---|---|---|
| MBB | -0.2% | +0.4% | +3.9% | +4.7% | +0.3% | +1.2% | 4.33% |
| VTI | +3.3% | +14.6% | +24.2% | +20.9% | +12.3% | +14.9% | 1.02% |
Total returns including dividends, from adjusted daily closes as of 2026-08-07. 3Y/5Y/10Y are annualized. Yield is trailing-12-month distributions over the last close. Past performance does not predict future results.
Project the growth of $10,000 in MBB vs VTI →
Shared Holdings(0)
These two funds have no holdings in common.
Frequently Asked Questions
How much do MBB and VTI overlap?
MBB and VTI overlap by 0.0% of portfolio weight. They share 0 holdings (MBB holds 11144 positions and VTI holds 3505), based on each fund's latest SEC-reported holdings.
Is it redundant to own both MBB and VTI?
The two portfolios are 0.0% identical by weight. Owning both is genuine diversification: the funds hold almost none of the same securities.
What does MBB own that VTI doesn't?
11144 positions (98.1% of MBB) are unique to MBB, led by Freddie Mac Pool, Ginnie Mae and Uniform Mortgage-Backed Security, TBA. In the other direction, 3505 positions (99.6% of VTI) are unique to VTI.